Doorcheck



April 2, 1935. G A, CARLSQN 1,996,537

DOORCHECK Filed March 19', 1934 to the jamb A.

Patented Apr. 2, 1935 DOORCHECK Gustav A. Carlson, Chicago, Ill., assignor to The Boye Needle Company, Chicago, Ill., a corporation of Illinois l Application March 19,

4 Claims.

This invention relates to a door check or cushioning device for doors'and the like. This invention constitutes an improvement upon my Patent 1,931,172, granted October 17, 1933, and upon my co-pending application, Serial No. 672,873, for Door check.

An object of the invention is to provide improved means for cushioning the closing of a door or the like and means for automatically resetting Vthe cushioning apparatus every time that the door is opened. The invention is particu-A larly useful in connection with screen doors which are urged toward the door frame by springs. Other specific objects and-advantages will appear as the spe'cication proceeds. The invention is illustrated, in a preferred embodiment, by the accompanying drawing, in which- Figure l is a plan View of my improved device showing the device applied to a door and door frame, the latter parts being shown in section; Fig. 2, a sectional view of the cushioning device, the section being taken'as indicated at line 2 of Fig. 1; Fig. 3, a sectional view, the section being taken as indicated at line 3 of Fig. l; and Fig. 4, a transverse sectional view, the section being taken as indicated at line ll of Fig. l.

In the illustration given, A designates a door frame provided with a door jamb A' and B designates a door hinged to the frame. The door is drawn toward the door frame by tension spring le.

In the use of the specific embodiment illustrated, a bracket or keeper member I is secured directly The bracket is provided with spaced arms l2 between which is secured a vertical pin i3. About the pin is rotatably carried a roller (not shown).

Secured to the door B is a tubular casing member i4 equipped at its rear side with an integra-l supporting ange l5. The flange is provided with a web attachment portion I6 provided at its ends with perforations Il' through which screws may be passed to secure the flange to the door. Adjacent the forward open end of tube I4 are formed integral locking pins I8 diametrically disposed on the tube It. A cap I9 is provided with cylindrical sides 23 having bayonet slots 2| therein adapted to receive pins i8. The head is also provided with a guide-boss 22 having a square opening therethrough adapted to receive the square stem 23. The head I9 is also provided with oil openings 24 on opposite sides of the boss 22. Integrally formed with the head I9 is a supporting flange 25 having integrally formed therewith an 1934, Serial N0. 716,334 (Cl. lf3-.84T

attachment'web 26. The web is provided at its ends with attachment openings 2l.

The stem 23 'isfprovided' at its outer end with a head or catch member 28, the head 28 being provided with a"'goo seneck'bend 29whic'h centers the head with respect to the's'tem 23 and also with respect to the pihl3. The head Ztvis providedwith al lateralfslot of-,substantially uniform width, andadjacent the forward end of the slot is a forwardly extending lip 3l.

The Vstern 23v is provided with a reduced inner endrpotion 32. A flexible head 33 is received on the reduced end 32 and secured thereon between spaced washers 34 by means of asc'rew 35, which threadedly engages'a tapped opening in the end of the stem. A disk 36 is held between the screw head 35 and the outermost washer 34. The nexible plunger head 33 is provided with a cylindrical wall 3l adapted to engage the inner walls of the tube and to form a tight seat therewith.

In the operation of the cushioning device, there is a tendency for the cylindrical wall 3l of the plunger head 33 to curl inwardly and thus break the seal. In order to straighten the cylindrical wall 3T and to maintain it in the proper parallel relation with the tube walls, I provide the rear end 38 of the tube with an annular guide-dange 3S, as shown more clearly in Fig. 2. It will be noted that there is a space provided between the cam walls of the flange 39 and the walls of the tube into which the cylindrical wall 3l of the plunger head is guided, thus straightening the cylindrical wall to its desired shape.

The rear wall of the tube is preferably recessed centrally and a tiny orifice 4I formed therein through which air may be slowly released in the cushioning operation of the device.

In order that the plunger may be' retracted to its full limit and to increase the ease of operation thereof, I enlarge the bore of the tube near its forward end, as indicated by the numeral A0. The enlargement tends to break the vacuum slightly and to permit the plunger to be withdrawn toits full limit. This insures accurate operation.

In the operation vof the device, with the door in closed position, as shown in Fig. l, when the door is opened, the pin I3 or its roller engages the outer jaw of the head and causes the valve stem 23 to be retracted. The outward swinging of the door finally causes the pin to clear the slot of the head and leaves the stem 23 in fully with` drawn position. When the door is closed, the lip extension 3| is brought into contact with the pin i3 and guides it into the slot 30. width of the-slot prevents rattling and insures a The uniform quiet sure movement in the closing of the door. The contact between the head and the pin forces the piston head 33 inwardly toward the rear wall of the tube. The slow escape of air through the orifice 4I results in a cushioning of the stem and it allows the door to come against the door jamb slowly and silently. The square stem is retained by the square opening in boss 22 against rotary movement so that the head 28 is always held in proper alignment with the pin I3.

The foregoing detailed description has been given for clearness of understanding only,l and no unnecessary limitations should be understood therefrom, but the appended claims should be construed as broadly as permissible, in ViewVv of the prior art.

I claim:

1. In combination with a door and door frame, supports carried by said door and door frame, a stem reciprocally guided in one of said supports, means associated with Asaid last mentioned support for cushioning the rearward movement of said stern, said means comprising a closed tube having its rear wall providedf'with an air-release orifice and with an air-tight 4head secured to the inner end of said stem, said tube-having `,an enlarged bore near its forward end, and releasable interlocking members carried by the other support and by the free end of said stern, one of said interlocking members comprising a stud and the other interlocking member comprising a head having a laterally extending slot, said slot having an open end adapted to receive said stud.

2. In combination with a door and door frame, supports carried by said door `and door frame, a

stem reciprocally guided in one of said supports, means associated with said last mentioned support for cushioning the rearward movement of said'stem, said means comprising a closed tube having its rear wall provided with a minute airrelease orice and with a substantially air-tight head secured to the inner end of said stem, said tube having an enlarged bore extending to one extremity of the tube and releasable interlocking members carried by the other support and by the free end of said stem.

3. A door check comprising: a pair of supports, 'one adapted to be secured to a door and the other to a door iframe, a closed tube secured to one of said supports, said tube having a minute orifice at one end, a stem reciprocally guided in said tube, a piston head secured to the inner end of said stem, said tube being provided with an enlarged bore at one extremity thereof wherein said piston may move freely at the end of its stroke, and interlocking connections carried by the other support and by the free end of said stem.

4. A door check comprising: a pair of supports, one adapted to be secured to a door and the other to a door frame, a closed tube secured to one of said supports, said tube having a minute orice at one end, a stem reciprocally guided in said tube, and a piston head secured to the inner end of said stern, said tube having a bore of substantially uniform diameter except that, at least at one end portion thereof, the bore is enlarged so that the piston may move freely therein at the end of its stroke.

GUSTAV A. CARLSON. 

